root/arch/sparc/prom/palloc.c

/* */

DEFINITIONS

1. prom_alloc
2. prom_free

   1 /* palloc.c:  Memory allocation from the Sun PROM.
   2  *
   3  * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
   4  */
   5 
   6 #include <asm/openprom.h>
   7 #include <asm/oplib.h>
   8 
   9 /* You should not call these routines after memory management
  10  * has been initialized in the kernel, if fact you should not
  11  * use these if at all possible in the kernel.  They are mainly
  12  * to be used for a bootloader for temporary allocations which
  13  * it will free before jumping into the kernel it has loaded.
  14  *
  15  * Also, these routines don't work on V0 proms, only V2 and later.
  16  */
  17 
  18 /* Allocate a chunk of memory of size 'num_bytes' giving a suggestion
  19  * of virtual_hint as the preferred virtual base address of this chunk.
  20  * There are no guarentees that you will get the allocation, or that
  21  * the prom will abide by your "hint".  So check your return value.
  22  */
  23 char *
  24 prom_alloc(char *virtual_hint, unsigned int num_bytes)
     /*  */
  25 {
  26         if(prom_vers == PROM_V0) return (char *) 0x0;
  27         if(num_bytes == 0x0) return (char *) 0x0;
  28         return (*(romvec->pv_v2devops.v2_dumb_mem_alloc))(virtual_hint, num_bytes);
  29 }
  30 
  31 /* Free a previously allocated chunk back to the prom at virtual address
  32  * 'vaddr' of size 'num_bytes'.  NOTE: This vaddr is not the hint you
  33  * used for the allocation, but the virtual address the prom actually
  34  * returned to you.  They may be have been the same, they may have not,
  35  * doesn't matter.
  36  */
  37 void
  38 prom_free(char *vaddr, unsigned int num_bytes)
     /*  */
  39 {
  40         if((prom_vers == PROM_V0) || (num_bytes == 0x0)) return;
  41         (*(romvec->pv_v2devops.v2_dumb_mem_free))(vaddr, num_bytes);
  42         return;
  43 }

/* */